Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfcaf908800021d8048845c39a7b015f5a400d87ae4c52315b163457ac8920eb' 
  AND token = 'MaPaaddDJooKgkLPY4EOqHCe8quDrI1VPgSYKMseypc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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