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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a47d48932a64af33b498c84c17162ea022abecf8edf4cb22334959deabacf3b' 
  AND token = 'b0FpJd91rDDlgZhgKIdp7H52tZ58EATf6Pgl8ya+Dyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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