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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79d4fa33d05b19478ef3510d2c35dc072d9cd1dc0eaed9b540774e0a00c39e5' 
  AND token = 'gg6fTmvkmznPOAc8XEnX0pjbS1ioZxuK8g6lzxERVHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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