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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2129dc9bb04de80bb04dc2f3066092f2f01ead29592801d82a81d8de094992c7' 
  AND token = 'MHS7eUtpCDkLQ5SXUtQUWN7OP/tMCB9qCFw6wdeobs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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