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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c07e72c392bdb8ac90cee9d1498515f04e2ea61408d6e44b380840ef7197e1' 
  AND token = 'Xuec2EUK7KUwfW0T3cfXl9C8BXoehGMk72MDfW0jdt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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