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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca837a16b8577521aba067c7b21b9e30339b57f9460702da5b286e065e54a17' 
  AND token = '6Vsay5Kl2QEPIYyJvXaYvc4gyv4l9moRCSWc9ko4uzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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