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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52eeb89558552f45b96fadbbbd22b342ed5dcffc9cf5cc8b14d5513a704d6ac' 
  AND token = 'bNGDUzEpIqLsCF+fFQG9k6pK3dyjawIoSlLMekSDBwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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