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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96c6c6b67c001ef3878d0fd1a3fc15779ee0efd460a9263f0c518be429af9c4' 
  AND token = 'WU6pXXb3ewsm18vskzv/PHwcN+TxQgb2leJXbzhHPJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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