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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9f2acf23bdef598321587c10482b1a3a5c9bb778dfcce18ed1f258cac2279d' 
  AND token = 'Wzy1SCc8H8HewLORITtJLr1/qDICq/APRtCdXbkYJIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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