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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ace558c5eef5c008f2e7e359a66151d0b65ff9a5b23e311ea88081e7822d2c' 
  AND token = 'UM2rszftR30OUY28C5+raGvY4L6loYlhVWkv2OTgmu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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