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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9a6e5006562fc0613182d8ac3c96f9ef07d10b172c57a6af8d3a2e85ef3c29' 
  AND token = '9K0kV27pVdcaMJ61nVjVuSxPZx4ASE0d3NU6mlQe0cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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