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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85283d07eaa735b1c4abea10e20d1c4a69c804c4a8e083d9b11061d1378e6206' 
  AND token = 'BndpXvw1B4hC10HJH7yM7nQSrKn1i3TZleDcUamEDZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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