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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b143ea3718c845a155d8a989d54fd9d5ce8fd12182f2415a8183ce8216dcf44' 
  AND token = 'inz7qZORQdbF/dAbf7B3GaUYtkRPiJSB4OUeUWP4gIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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