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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1264446ceba1ee5378c9a809594c7ef0b72b41e3c84ba904c3c62d9adba304c' 
  AND token = 'Dwh9f9jQHU4z+kysiAT64whX0OKw58nCB2Dy9LtTfnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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