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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f5d2755fee81ee81b76c5eef705c8049b7052beef56dd7334aa544358e0e6ba' 
  AND token = 'z6bvlkw/BpRXKy9Tu2EsVMptDfMZzTVr1Cth8aQk+/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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