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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e118503aff3da444b762958e6177b30fa906c6bc32ad1c940b3b0c8478de02' 
  AND token = 'cfoyWJupIZo5jXDNK+z9XaayIWB8k5up20nqMP3qqaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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