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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c83ba468cae1167594a8b645f795894a22516357e98253c7098d3e7eb718f88' 
  AND token = '6QVk8c5JjsSwCJHa0h+MAtVDNvEUK0HrtSHYaaTZh/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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