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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825533d60752b6e89adf964bcbccc275d598b2dafd473b370b4faf4b8992fc95' 
  AND token = 'EftlbDCawaNCjg+PSrZiA+dD/Iih/z7ijlnpa5Jtke4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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