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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cceb3de6552d15c63f18e0245ba73a6408e4725700c8b49803401d0c9479f3f' 
  AND token = 'te14ThNppfCct2AorpvVRSPnw8o4jn4c5Ic/javnIXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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