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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bb5d829233e97b87389f6ca6395071449d356faf72a3b73a10bc87cf7312ab' 
  AND token = 'J2FycwpuXGbybqIqtdcUugTc1PfeQtxE1y5Mvp8Gi2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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