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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b83b9ec1e27275ef161a37c469784b39b540ab7171149e1cf5c8dad7263818' 
  AND token = 'gkojT5MnRz0ys/NrSK5GdkykX+q/sU7u8XX/W3PzM2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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