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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f6beec74221bc75aed24ac26d48eee30aa287856b711db239e2fff3673ec82' 
  AND token = 'g3h4bffs2GNM+A3qjT9CcHFf3yH/DtwE8MdXxUEAaZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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