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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8465aae198ff61622d3b458570ca49025cd2039d184acf22d686014e786a9c03' 
  AND token = 'ccri1ZhwwvAR5KUQuwTi9Gt3U0ZNFl4lRCoCcgHfvlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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