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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6681dec2f8636e28f342d1514fcce33c61ee48866d7c39e6c3717635cbe4e5e' 
  AND token = 'gNrForBtOgMF3yU4iJYmRf9edpElxo0l6Wka4gRAvNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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