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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90d760642cc4941cc4d7d22fb8ff3fdcf6d5416da66c437f1d4aaeaa29180db' 
  AND token = 'FhBWDd2YopHskY+zPobLgbb94gfSvAj+1UGsc5Zew0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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