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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe9914067f8306f1abeb23425e6b3a6214be41b25f86c66f4d07576c76772625' 
  AND token = 'VyDbpyk57YfRWe5RTxkpIgOW5UPySzr15EO9P2DCBUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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