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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0730991e6db32f63a4b6bcd2366adb8f694c295db06f1b1824e3c25cff0a1d5d' 
  AND token = 'Z+6SgleEthtD6snZIt5+HCSPstcejXFu6hgqiK9RLP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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