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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827c691e682e1e773208037361c921d824cf824f7103e26a7712c1ae219f5568' 
  AND token = '1QJzFnZXVi7hqY/+16R0WkyDffSAfzzRS2hw3+jbqVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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