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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caf070182eeb5ffb8a3ed87b3868c52dd2a02daa3e7eabe580866058fde9af6f' 
  AND token = 'baBpPg66xi+E9LH/VE9gIsDWXsXWevTouoHhTUqcDpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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