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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281728845015c0fe26a20df4f0b4273894c14c0f82219f304885cf74e04f35d7' 
  AND token = 'X/WxLNJXcb2rclYCuyoJS62Cs6Z2rsHbaD/9bkrq6i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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