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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba1e813668dcf696e5b4b0d0cd2df71bc63f16d1a4a46fcd47625943ec7b052' 
  AND token = 'KeFoyWNl8OynHZghymj9ZJ3icZ6J2nJr87x61ugvF2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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