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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a8b4b143fa9c0f2f033439e0dc82204cd5fd4a622cfc2e56c6508d5d32537c' 
  AND token = 'M/8wWHRM/Pnznk2I3VHlzDJyyAmspie2RJ5w10DhPaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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