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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b2925d955b28b31ca5728c63189193b38f390137ac2ec82403b5826f41b71f' 
  AND token = '8PtMFwbo8C2UfpOAPWVhU90vvx/bDzbszhS2YQoapzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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