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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c92a197d603983d2083ef7c8dfdd96947f711d6ab2fb5dac2bb399923ef882' 
  AND token = 'sI0Lro3eV1sAtOcXNq1gmu+gSGjirHeokzWa8niFPqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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