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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0fc06f7e68423bcfef82f9766c68cb69e83c9e16ee2e0ba878029898ed620d' 
  AND token = 'XCilwfJ5xcQZyk1d9oWOCyFhJCrkNWaxpm8yywkH7jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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