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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68402824200a237aced566620b5024972c378016c155bf935edd83c5dca9c9db' 
  AND token = 'l16U7bjHLR6/ufG36rQejTzPvAh3Jv8sxcr6HwnwA2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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