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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e733603f5470b76535bb48af933c820bd3049c3c6abe386448c6d78ac722ed78' 
  AND token = 'Me6NsdNq5zS5iZ85QmMzntLIqFAIsJOSK/gxM5xFqcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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