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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569af45224de22b8ad6e9c9762750468a33782fff667bfacd194f1f8645af971' 
  AND token = 'e15DUfO84xxB5fXtT4k52Tkwa9MoR3toI7jslMI+nGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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