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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db6f52ae9b9e6c2ac55f643bbba9abc0d1a0d67b516e16745f667cf2f113f857' 
  AND token = 'l3+RsqTAlVIjJ1v2D62JUxjuIjzfLgIb9LSPbU4DTio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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