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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace554e07f453e3e2db0238ba01d3562e4d04b16b26a620487b0040fdd8ab0cb' 
  AND token = 'H595//xeGu4+Fb41TJBJvqyCkSfgU/w79j1Z6uBFmMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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