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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf6a4e5322daaa14ac3e3770b9dfe0dee2290d4c4b3bec9a24404dfad48e61e' 
  AND token = 'yOlP3Ijblt8dcPJxS/BkHvO0LyWp+OK1odiEVItoKIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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