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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63cfcca32d6c33a420fdd0f0177814d5a93a590077d9ac646c02fae94cc91eb4' 
  AND token = 'RxYd0ByRl38B7N1SY8froLkB+X/wtl1wVMf9LAupwf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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