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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce605b787b997ac2789e54f34513fcc060e14a492bf40ba36801068075c58c6f' 
  AND token = '3fSgMg6251yfbr/In6Kgq9gbxV4bkqo8woN5ifD5vkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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