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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f48861daf21fc400089e231ff1ad82e61867659dff44abc5f14e5cd4a9bc92c' 
  AND token = 'DDkVaabcraTD0A04wwcbQkwdISLnydMc1S9+eF5lAUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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