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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae47b6059242c2dff2a5e32e2b59a8325cb033cc1f42b178de4a87167be397f9' 
  AND token = '0VMBYehh47wqP/6BYrQOPXh3SifIrTUir4ko0kodP9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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