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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e75e3dc300965607c7e8951e89fc16f07f7b27aac8c8342cfbfe3d300ed0e31' 
  AND token = '7m1v4NKopvGtQ85ojjPXoHwcvv+Dhpi1yqXBt192Tvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}