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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab4ad5d8de54b7bc9f4f832483b758d9da5a0ed9583ce118b46d039fab1d710' 
  AND token = 'fcChkTGKddIJB6tksQ6woc33eoJOEy3HbcTAmJMdzQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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