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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12f3ff1f6addc8d37ea80c4dc28b41e8a95144ef0d7d47fd9ea5b26ad618a112' 
  AND token = '0SLN/ZhSZTc11f5PLot0m3WLIe40w/TFtmpW1Q8+Q7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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