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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11854fc5d0308373bcb85262f2be336c801bb8a1ef08c2298aa6ef80df342c28' 
  AND token = '7h227n8M4l9ePXs7YxgDiNUHUNUyJl0J6arvZoLqvYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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