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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06da4c8688856c595993e6d3ecc6a042d13c861834ad7f235ec5b34a0653b420' 
  AND token = 'VKCUgHuQgS63sgusMtdBlJUGAtrxB6khmglx6eBBYyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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