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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2921261596a690ab143e4c032a7ba5e856694bcef59d471f276962e002408d1f' 
  AND token = 'zdWtqcne023aMjQpvQ6hdNROt48QYgy5swNyOHVJcg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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