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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a318324eeb7d8854f3337b197bf62262708d5b71b715e69d7bc9c7789c12b1f' 
  AND token = '99Qklyu7qT8Ie61CQdkgM+dlwGrWC5OlvGuB3RALr0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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