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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc074f1c64b8d67a55814c5def4164e2a6503cf132edcdaa1015fcfb400034f' 
  AND token = 'RVPX4ZkNwMB2igqW/D91pDQUP9PqoPmZUqmhaHx+7rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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