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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83f71fc94692a2cabdfda873bb80fb7d5c3cab5c8c5e77d55178a28d64e62d9' 
  AND token = 'Z0QsadCLPo2Xmo42HFwJxawdQwxBgrnsqiFfja2S9Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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