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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dce8339d34fbc9854118f984b9afebb6c73f345dc6f94754cc8c7da3132e5d7' 
  AND token = '7D5fhr3NZkFN1EKkwcREeoNIgedfX4KKuwecoRe1xmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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