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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998e30b90e54551980f59df889cc8e044cfc9b6c0eed91f68dc8d9ca0b03c417' 
  AND token = 'LG6/WH/5pLLjQTQJnxjnbKhqzluLF2dxHIeqOtUNPso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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