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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1855b15877b8877c0b8cc64b56e0db72da2ffce772caff9ee43ec7d8f31577a7' 
  AND token = 'fd5ZcCEPZmaAo4WFNMvKFqTwM3IsSkWjBQhgu39CKp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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