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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf230a05552c3441f6ee8e928e6483c9e6eaa47e04e9994ecbb8e9a735af6d0' 
  AND token = 'IYprrFSzqb9dsNN4TpNI6QsDpH35h5USz33O3bpIqRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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