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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032d3e2b49e5a14b958dee8c442f52319e6cc3e5f4942ea43c487630e46b3254' 
  AND token = 'G8sWTNDZAH3rRXrcQZWcbA8buB41hbFSfmcXjm2aWaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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