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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb032ee2a32ea0d5bcd54287a3e4da164670048de164798b858e457fd2a199d' 
  AND token = 'COL64M84cZNvK6SSHqbuu2CViPKu+alNz6IXkCjPsNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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