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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76f64f0c98b94b8be249b13164aaac5f92d760b62701a92edd966e10277f33d' 
  AND token = '3aWOjRrMxriuGg/35rLBcjk+trNL58Amor34dxoey18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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