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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca7f31467479c9af6dc53c934055c7f7b4eb9bada080ffd75d9c26643d08563' 
  AND token = '1WkPhMLUE/ZUiD9SfXq/UY63qz3eEKK1TkDN83vyQ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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