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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d1df8966ae0d768b8a72a4a535f6bef62e0b974be30b16ac8ef2a29f7f5054a' 
  AND token = '6xHmwhnc0E4SjmSftodE8wVnS4GsXxTZJ9MV+OxqMe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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