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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3c9692f5334ccc6570176edd6b9d4cf1ec69b22a2afc53d44f2e6aed258773' 
  AND token = 'aV6rOof6l+sof9E4WrmbdHFKjvbJEieV/Oq+FpydaLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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