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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840200730f95b73008243a31ec89d89a967fcb9163e1491c79eb114935451ecf' 
  AND token = '+hSITrcn0pqB2kuiii+J2KOJNWEM9tPf3h8OrSV1Qak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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