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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10590afad4a67eca2f8a844ac938fcfec0ac97c8dfdfe5424fde26e165d49cec' 
  AND token = 'FrzYtiAkEhz42XbFxX/eZL0IWwK7JUvu0ky7Oi+1dUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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