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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abbec190c4b5a742bf6db9e9377863c4b259df44c9b53b154962a756ed7947a8' 
  AND token = 'hquwHs6zcl1Eov8t54zcL0NrOLdb8j7o3FGtRGdqQF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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